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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button class="btn">打印结果</button>
    <script src="../../../jquery-3.2.1.js"></script>
    <script>
        $('.btn').click(() => {
            console.log('完成点击');

            $.ajax({
                method: 'get',
                url: "",
                success: (data) => {
                    console.log(data); //成功

                },
                error: (err) => {
                    console.log(err); //失败
                    reject(err);
                }
            })
            Promise.then((res) => { //接收成功状态
                console.log(res);

            })

            Promise.catch((err) => { //接收失败状态
                console.log(err);

            })
        })
    </script>
</body>

</html>